Onion Cultivation in the Off-season of Northern China

I. Selection of varieties The selection of good varieties is the key to high yield in low season. Should choose green onion scallion (scorpion onion) alone obvious advantages, not easy to produce two or three varieties of green onions. Otherwise, after the convulsions in the spring of the following year, two or more than two leeks will be issued, which will affect the quality and effectiveness of onions. Second, cultivation technology Sowing and raising seedlings: The appropriate sowing time in Shenyang is from June 20 to July 10 (other areas can be calculated based on this time). Choose the terrain with high dryness and fertile soil to make rakes, which are 1.5 meters to 2 meters wide and 10 meters long. Drill or broadcast. 34 grams of seeds per 10 square meters. 2. Transplanting: On September 20-October 5, timely land preparation, Mushi base fertilizer from 8000 kg to 10,000 kg, compound fertilizer from 25 kg to 40 kg, and 40 kg of potash. It is 1.5 meters wide and 10 centimeters high. During the transplanting, the green onion shall be excavated, graded, and the green onion shall be inserted under the membrane with a device for inserting onion, and the spacing shall be 16 cm to 20 cm, the spacing of the plants shall be 8 cm to 13 cm, and the seedlings shall be planted and then irrigated. 3. Post-planting management: It is best to seal the frozen water before the soil is frozen, which is conducive to overwintering the onion seedlings. In winter and spring, the wind is big and it is necessary to prevent the film from being blown by the wind. After the temperature rose in early spring, it was poured into Qingshui. Due to the cover film, the ground temperature rises quickly and returns to early morning. After onset of warming, the onion seedlings begin to sprout. The buds should be removed promptly to promote the rapid growth of leeks, reduce the consumption of nutrients, and transform the welsh onion from reproductive growth to vegetative growth. Third, the management of bladder onions 1. Fertilizer management: The management of fertilizer and water should be carried out after the leeks are sprouted to promote the rapid growth of leeks. The growth regulator can be sprayed in combination with Shi Ye Fa Fei (25 grams of urea and 63 grams of potassium dihydrogen phosphate per pot of water). At the same time, pay attention to the spraying of pollution-free pesticides to prevent the damage of leafflies, onions, horses and other pests. 2. Timely harvest: This method of cultivation of welsh onion harvest period in late June - late July, when the onion off-season, the market is tight, onion can produce about 10,000 kilograms per acre. Fourth, pay attention to the problem 1, can not blindly use the species to prevent the occurrence of three leeks. 2, sowing can not be too late, so as not to affect the growth of spring onions and yield. 3, timely pick buds to prevent nutrient consumption. 4. Harvest in time to prevent over-lying onions.